1 .
A tap can fill an empty tank in 12 hours and a leakage can empty the whole tank in 20 hours. If the tap and the leakage are working simultaneously, how long will it take to fill the whole tank?
[ A ]    25 hours
[ B ]    40 hours
[ C ]    30 hours right
[ D ]    35 hours
[ E ]    none of these
Answer : Option C
Explanation :
Workspace Report error
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